M41T81 datasheet(23/30 Pages) STMICROELECTRONICS

23 / 30 page

M41T81

DC and AC parameters

23/30

Figure 15.

Power down/up mode AC waveforms

Table 9.

DC characteristics

Sym

Parameter

Test condition(1)

Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 2.0 to 5.5V (except where noted).

Min

Typ

Max

Unit

ILI

Input leakage current

≤VIN ≤VCC

±1

µA

ILO

Output leakage current

≤VOUT ≤VCC

±1

µA

ICC1

Supply current

Switch freq = 400kHz

400

µA

ICC2

Supply current (standby)

SCL,SDA = VCC – 0.3V

100

µA

VIL

Input low voltage

–0.3

0.3VCC

VIH

Input high voltage

0.7VCC

VCC + 0.3

VOL

Output low voltage

IOL = 3.0mA

0.4

Output low voltage (open

drain)(2)

For IRQ/FT/OUT/SQW pin (Open Drain)

IOL = 10mA

0.4

Pull-up supply voltage

(open drain)

IRQ/OUT/FT/SQW

5.5

VBAT

(3)

STMicroelectronics recommends the RAYOVAC BR1225 or BR1632 (or equivalent) as the battery supply.

Battery supply voltage

2.5(4)

After switchover (VSO), VBAT (min) can be 2.0V for crystal with RS = 40KΩ.

33.5(5)

For rechargeable back-up, VBAT (max) may be considered VCC.

IBAT

Battery supply current

TA = 25°C, VCC = 0V

oscillator on, VBAT = 3V

0.6

µA

Table 10.

Crystal electrical characteristics

Sym

Parameter(1) (2)

Externally supplied. STMicroelectronics recommends the KDS DT-38: 1TA/1TC252E127, Tuning Fork Type (thru-hole) or the DMX-26S:

1TJS125FH2A212, (SMD) quartz crystal for industrial temperature operations. KDS can be contacted at kouhou@kdsj.co.jp or

http://www.kdsj.co.jp for further information on this crystal type.

Load capacitors are integrated within the M41T81. Circuit board layout considerations for the 32.768kHz crystal of minimum trace lengths and

isolation from RF generating signals should be taken into account.

Min

Typ

Max

Units

Resonant frequency

32.768

kHz

Series resistance

Ω

Load capacitance

12.5

AI00596

VCC

trec

tPD

VSO

SDA

SCL

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